Which of the field is reserved for use as a primary key?(a) _id(b) _ui – InterviewSolution

InterviewSolution

1.	Which of the field is reserved for use as a primary key?(a) _id(b) _uid(c) _uuid(d) All of the mentioned
Answer» Correct answer is (a) _id Easiest explanation: ID value value must be unique in the collection, is immutable, and may be of any type other than an array.

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